Overall this chair has a great design for keeping your baby upright and snug and therefor safe. My son, who is now 6 months just started agreeing to sit in it around 5 months, I think because before he didn't like the fact it was so snug and he couldn't really move his legs. But I keep him in the kitchen with me and at the table doing homework in it and he now loves to be able to sit up and be part of what is going on, thanks to this chair. Sturdiness This chair is very sturdy. I feel comfortable leaving him in it without it flipping over. Its made from some sort of foam, so it is soft to sit in for longer periods of time, but its a durable, easy to clean foam. Durability This chair seems very durable. The foam stuff its made out of isn't easily chipped or ripped and it doesn't break or crack if stepped on. The tray is easily taken on and off which means that I am less likely to break it! Design The design is great. It doesn't flip or teater at all so it is very safe. The leg openings are snug around your babys legs and it keeps them held up right with ease. Safety Very safe. Doesn't flip, nice smooth design so its comfortable to sit in and on babys legs. Ease of Cleaning Very easy. Nothing that your baby can get on this cant come off with anything more than just a wet paper towel.